U.S. patent number 6,367,920 [Application Number 09/754,258] was granted by the patent office on 2002-04-09 for ink cartridge for ink-jet recording apparatus, and ink-jet recording apparatus.
This patent grant is currently assigned to Seiko Epson Corporation. Invention is credited to Masahiro Kanai, Akihiko Kitazawa, Yuichi Seki, Masanori Takemura.
United States Patent |
6,367,920 |
Kanai , et al. |
April 9, 2002 |
Ink cartridge for ink-jet recording apparatus, and ink-jet
recording apparatus
Abstract
An ink cartridge for an ink-jet recording apparatus including an
ink supply opening having a packing member capable of closely
contacting with the outer circumference of an ink supply needle,
the packing member is made of a thermoplastic elastomer containing
25% or less by weight of a polyethylene oil.
Inventors: |
Kanai; Masahiro (Nagano,
JP), Seki; Yuichi (Nagano, JP), Takemura;
Masanori (Nagano, JP), Kitazawa; Akihiko (Nagano,
JP) |
Assignee: |
Seiko Epson Corporation (Tokyo,
JP)
|
Family
ID: |
18531410 |
Appl.
No.: |
09/754,258 |
Filed: |
January 5, 2001 |
Foreign Application Priority Data
|
|
|
|
|
Jan 11, 2000 [JP] |
|
|
12-002277 |
|
Current U.S.
Class: |
347/86;
428/480 |
Current CPC
Class: |
B41J
2/17523 (20130101); Y10T 428/31786 (20150401) |
Current International
Class: |
B41J
2/175 (20060101); B41J 002/175 () |
Field of
Search: |
;347/7,85,86,87
;428/480,412 ;521/48 ;524/569 |
References Cited
[Referenced By]
U.S. Patent Documents
|
|
|
5149589 |
September 1992 |
Naritomi et al. |
5270381 |
December 1993 |
Yamanaka et al. |
5657058 |
August 1997 |
Mochizuki et al. |
5949458 |
September 1999 |
Studholme |
|
Foreign Patent Documents
Primary Examiner: Le; N.
Assistant Examiner: Vo; Anh T. N.
Attorney, Agent or Firm: Sughrue Mion, PLLC
Claims
What is claimed is:
1. An ink cartridge for an ink-jet recording apparatus, which
comprises an ink supply opening having a packing member closely
contactable with an outer circumference of an ink supply needle
provided in an ink-jet recording apparatus main body, wherein the
packing member is made of a thermoplastic elastomer containing 25%
or less by weight of a polyethylene oil.
2. The ink cartridge for an ink-jet recording apparatus according
to claim 1, wherein a rubber hardness of the thermoplastic
elastomer is 40 to 70 in Shore hardness.
3. The ink cartridge for an ink-jet recording apparatus according
to claim 1 or 2, wherein the packing member comprises a contact
tongue piece tiltingly protruded into an interior of the packing
member to be contactable with the outer circumferential surface of
the ink supply needle.
4. An ink-jet recording apparatus comprising an ink supply needle
communicating with an ink-jet recording head, wherein an ink supply
opening of an ink cartridge for an ink-jet recording apparatus is
closely contacted with the ink supply needle via a packing member,
which is made of a thermoplastic elastomer containing 25% or less
by weight of a polyethylene oil.
5. The ink-jet recording apparatus according to claim 4, wherein a
rubber hardness of the thermoplastic elastomer is 40 to 70 in Shore
hardness.
6. The ink-jet recording apparatus according to claim 4 or 5,
wherein the packing member comprises a contact tongue piece
tiltingly protruded into an interior of the packing member to be
contact with the outer circumferential surface of the ink supply
needle.
7. A packing member mountable to at least one of an ink supply
opening and an ink supply needle to be sealingly connected together
for ink supply from an ink cartridge to a recording head, the
packing member essentially consisting of a thermoplastic elastomer
including one or more of a polystyrene component, a polyethylene
component, a polypropylene component, a polyester component, a
polyamide component, an ethylene propylene rubber component, an
ethylene butadiene rubber component, and a polyether component, and
containing a polyethylene oil 25% or less by weight.
8. The packing member according to claim 7, wherein the
thermoplastic elastomer contains the polyethylene oil 20% or
more.
9. The packing member according to claim 7, wherein a rubber
hardness of the thermoplastic elastomer is 39 to 71 in Shore
hardness.
10. The packing member according to claim 7, wherein a viscosity of
the thermoplastic elastomer is in a range of 100 to 10,000 cs.
11. The packing member according to claim 7, comprising:
a cylindrical body part having first and second ends; and
a conical part extending from the first end toward the second end
and located within an interior of the cylindrical body part.
12. The packing member according to claim 11, further
comprising:
a contact part on an end of the conical part opposite from the
first end, and larger in thickness than the conical part.
13. The packing member according to claim 7, wherein a composition
of the thermoplastic elastomer is polypropylene 40% by weight,
block copolymer of polystyrene-ethylene propylene
rubber-polystyrene 35% by weight, and polyethylene oil 25% by
weight.
14. A packing member adapted to be removably fitted onto an olefin
based amorphous polymer ink supply needle to define an ink supply
passage from an ink cartridge to a recording head, the packing
member is, at least partially, made of a thermoplastic elastomer
containing 25% or less by weight of a polyethylene oil.
Description
BACKGROUND OF THE INVENTION
The present invention relates to an ink cartridge for an ink-jet
recording apparatus, and an ink-jet recording apparatus. More
specifically, the present invention relates to an ink cartridge
provided with an ink supply opening having a packing member, and an
ink-jet recording apparatus having the ink cartridge.
Since a graphic process can be executed relatively easily owing to
development of personal computers, a recording apparatus has been
required, which can output a high quality hard copy of, for
example, a color image shown on a display. In order to respond to
such a demand, a recording apparatus mounting an ink-jet recording
head thereon has been provided.
Since the ink-jet recording apparatus is relatively small in
printing noise and can form small dots at a high density, the
ink-jet recording apparatus is used for many kinds of printing
including color printing.
For ink supply to a recording head in the ink-jet recording
apparatus during printing and recording, an ink supply needle
communicating with the recording head for ejecting ink is inserted
into an ink supply opening of an ink cartridge for an ink-jet
recording apparatus so that the ink in the ink cartridge is sent to
the recording head via the ink supply needle. In order to prevent
problems, such as drying of the ink by the contact with the outside
air and introduction of air bubbles in the ink, the ink supply
needle is formed using an olefin based amorphous polymer high in
molding property and extremely low in gas permeability, while the
ink supply opening is provided with a packing member closely
contactable with the outer circumference of the ink supply needle,
thereby securing the sealing property of an ink channel. Since ink
replenishment is executed by replacing ink cartridges, the ink
supply opening of the ink cartridge and the ink supply needle
should be attached or detached easily. For this reason, a butyl
rubber is widely used as a material of the packing member.
However, the butyl rubber is not always stable with respect to
various kinds of ink, and thus the butyl rubber may cause an
unsatisfactory result when used in combination with certain kinds
of ink. Moreover, since molding of the butyl rubber is
accomplished, in general, by a compression molding method, the
dimensional accuracy is unstable due to irregularity of the
material thickness. Therefore, in practice, finish inspection for
all of products is required to ensuring the product quality.
As a material to be adopted in place of the butyl rubber having the
aforementioned disadvantage, a thermoplastic elastomer is
conceivable, which exhibits rubber elasticity in an ordinary
temperature but plastic and moldable property by application of
heat. The thermoplastic elastomer is high in stability with respect
to ink, and also high in dimensional accuracy because the
thermoplastic elastomer can be molded using an ordinary injection
molding method.
However, in the case such a thermoplastic elastomer is used for a
packing member in an ink supply opening of an ink cartridge for an
ink-jet recording apparatus, and the packing member is closely
contacted with an ink supply needle by inserting the ink supply
needle into the ink supply opening, the ink supply needle made, in
particular, of an olefin based amorphous polymer is deformed after
a certain time so that it is difficult to pull out the ink supply
needle from the ink supply opening of the ink cartridge as well as
to insert the ink supply needle into an ink supply opening of a new
ink cartridge. This will cause a malfunction of the ink-jet
recording apparatus.
SUMMARY OF THE INVENTION
In view of the above-mentioned problems, the invention has been
achieved, and an object thereof is to provide an ink cartridge,
adapted for an ink-jet recording apparatus, which comprises an ink
supply opening having a packing member high in corrosion resistance
with respect to various kinds of inks, stable in molding process
accuracy, and free from the risk of causing a malfunction of the
ink-jet recording apparatus. Another object of the present
invention is to provide an ink-jet recording apparatus having such
ink cartridge.
As a result of elaborate experiments by the present inventors, it
was found out that the above-mentioned object can be achieved by
adjusting the amount of a polyethylene oil to be added generally to
a thermoplastic elastomer for obtaining an appropriate flowability
required at the time of molding, and an appropriate rubber hardness
of a member required after molding. That is, the technological
configuration and the effects of the invention are as follows.
An ink cartridge for an ink-jet recording apparatus according to a
first aspect comprises an ink supply opening having a packing
member capable of closely contacting with the outer circumference
of an ink supply needle provided in an ink-jet recording apparatus
main body, wherein the packing member is made of a thermoplastic
elastomer containing 25% or less by weight of a polyethylene oil.
Since the packing member is made of a thermoplastic elastomer, a
packing member with a high corrosion resistance with respect to
various kinds of inks, and a stable molding process accuracy can be
provided. Moreover, since the thermoplastic elastomer contains 25%
or less by weight of a polyethylene oil, in the case of inserting
an olefin based amorphous polymer ink supply needle in an ink
supply opening, the packing member can hardly degrade the quality
of the olefin based amorphous polymer ink supply needle. Therefore,
an ink cartridge for an ink-jet recording apparatus comprising an
ink supply opening having a packing member without the risk of
causing a malfunction of the ink-jet recording apparatus can be
provided.
In the ink cartridge for an ink-jet recording apparatus according
to a second aspect, the rubber hardness of the thermoplastic
elastomer is 40 to 70 (Shore hardness). Accordingly, the packing
member and the ink supply needle can be contacted particularly
closely so that the sealing property of the ink channel can be
maintained further certainly. Therefore, an ink cartridge for an
ink-jet recording apparatus capable of preventing problems such as
drying of the ink by the contact with the outside air, and
introduction of bubbles can be provided.
In the ink cartridge for an ink-jet recording apparatus according
to a third aspect, the packing member comprises a contact tongue
piece tilingly protruded into an interior of the packing member so
as to contact with the outer circumferential surface of the ink
supply needle. The contact tongue piece can easily be deformed
elastically so that stable contact with the ink supply needle can
be ensured by tolerating, for example, size displacement in
mounting. Therefore, an ink cartridge for an ink-jet recording
apparatus capable of preventing problems such as drying of the ink
by the contact with the outside air, and introduction of bubbles
can be provided.
An ink-jet recording apparatus according to a fourth aspect
comprises an ink supply needle communicating with an ink-jet
recording head, wherein an ink supply opening of an ink cartridge
for an ink-jet recording apparatus is closely contacted with the
ink supply needle via a packing member, which is made of a
thermoplastic elastomer containing 25% or less by weight of a
polyethylene oil. Since the packing member is made of a
thermoplastic elastomer, a high corrosion resistance with respect
to various kinds of inks can be provided to the packing member, and
a molding process accuracy of the packing member can be stabilized.
Moreover, since the thermoplastic elastomer contains 25% or less by
weight of a polyethylene oil, in the case of inserting an olefin
based amorphous polymer ink supply needle in an ink supply opening,
the packing member can hardly deform the olefin based amorphous
polymer ink supply needle. Therefore, an ink-jet recording
apparatus with an ink supply opening of an ink cartridge for an
ink-jet recording apparatus closely contacted via a packing member
without the risk of causing a malfunction of the ink-jet recording
apparatus can be provided.
In the ink-jet recording apparatus according to a fifth aspect, the
rubber hardness of the thermoplastic elastomer is 40 to 70 (Shore
hardness) . Accordingly, the packing member and the ink supply
needle can be contacted particularly closely so that the sealing
property of the ink channel can be maintained further certainly.
Therefore, an ink-jet recording apparatus capable of preventing
problems such as drying of the ink by the contact with the outside
air, and introduction of bubbles can be provided.
In the ink-jet recording apparatus according to a sixth aspect, the
packing member comprises a contact tongue piece tiltingly protruded
into an intetior of the packing member so as to contact with the
outer circumferential surface of the ink supply needle. The contact
tongue piece can easily be deformed elastically so that stable
contact with the ink supply needle can be ensured by tolerating,
for example, size displacement in mounting. Therefore, an ink-jet
recording apparatus capable of preventing problems such as drying
of the ink by the contact with the outside air, and introduction of
bubbles can be provided.
The present disclosure relates to the subject matter contained in
Japanese patent application No. 2000-2277 (filed on Jan. 11, 2000),
which is expressly incorporated herein by reference in its
entirety.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view showing an ink cartridge for an
ink-jet recording apparatus according to an embodiment of the
invention.
FIG. 2. is a schematic diagram showing an ink-jet recording
apparatus in which the ink cartridge is installed.
FIG. is a cross-sectional view showing the ink-jet recording
apparatus and the ink cartridge.
FIG. 4 is a principal part enlarged view of FIG. 3.
FIG. 5 is a cross-sectional perspective view showing a packing
member provided in an ink supply opening of the ink cartridge.
FIG. 6 is a state diagram of an ink supply needle before an ink
cartridge mounting-leaving test.
FIG. 7 is a state diagram of an ink supply needle after the ink car
ridge mounting-leaving test (60.degree. C., three days) using the
packing member obtained in the example 1.
FIG. 8 is a state diagram of an ink supply needle after the ink
cartridge mounting-leaving test (60.degree. C., three days) using
the packing member obtained in the comparative example 1.
FIG. 9 is a state diagram of an ink supply needle after the ink
cartridge mounting-leaving test (70.degree. C., three days) using
the packing member obtained in the comparative example 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Hereinafter, an embodiment according to the invention will be
described. However, the invention is not limited to the embodiment,
but can be modified as desired without departing from the spirit
and the scope of the invention.
FIG. 2 is a schematic diagram of an embodiment of an ink-jet
recording apparatus including an ink cartridge for an ink-jet
recording apparatus according to the invention. A carriage 1 is
provided on guides 2, 2 reciprocally movably in the axial direction
of a platen 3. The carriage 1 is provided with an ink-jet recording
head 4 for ejecting ink droplets in response to a printing signal,
and an ink cartridge 5 for an ink-jet recording apparatus
(hereinafter also referred to simply as an ink cartridge) for
supplying an ink thereto. A cable 10 serves for transmitting a
printing signal to the ink-jet recording head 4.
More specifically, as shown in FIG. 1, the ink cartridge 5
according to the embodiment of the invention is designed such that
an ink supply opening 15 is provided integrally to a bottom of a
container 11 forming an ink cartridge 5 main body. A lid 22 is
provided on the upper part of the container 11. A filter 17 made of
a polymer material, an corrosion resistive metal, or the like, of
about a 20 to 100 .mu.m mesh size is welded and fixed to the ink
supply opening 15 projecting inward of the ink container 11. A
packing member 19 capable of closely contacting with the outer
circumference of an ink supply needle is provided on the tip end
opening side of the ink supply opening 15. As a sealing member 20
with a high airtight property, capable of allowing an easy piercing
operation of an ink supply needle without the risk of breakage by
an external force such as contact, for example, a polymer film, a
film with a metal layer laminated on a polymer film, or the like,
is welded on the ink supply opening 15.
A porous member 21 for keeping ink, produced so as to have a
cross-section slightly larger than that of the container 11, is
stored in the container 11 with the lower end part elastically
contacting with the filter 17 of the ink supply opening 15, and the
periphery of the porous member 21 pressured by the side wall of the
container 11.
Electrodes 6, 7 are provided for detecting the state in which the
ink of the ink cartridge 5 exists only in the ink supply opening
15, that is, the so-called ink near end state. One of them is
provided at the bottom part of the container 11, and the other at
the ink supply opening 15. These electrodes 6, 7 are employed for
outputting a signal when the ink in the porous member 21 gets short
so that the entire ink residual amount is drastically getting
short.
As shown in FIG. 3, the ink-jet recording apparatus according to
the embodiment of the invention can be obtained by pushing an ink
supply needle 14 communicating with the ink-jet recording head 4
into the ink supply opening 15 of the ink cartridge 5 with the
above-mentioned configuration. In this process, the ink supply
needle 14 reaches at the packing member 19 through the sealing
member 20. Accordingly, the tip end part of the ink supply needle
14 can be in the fluid-tight state with the ink supply opening 15
via the packing member 19 so as to communicate with the ink in the
ink supply opening 15. At the time of inserting the ink supply
needle 14 through the sealing member 20, the sealing member 20 is
deformed owing to its elasticity along the tip end shape of the ink
supply needle 14 as much as possible so as to prevent introduction
of air.
An ink-jet recording apparatus according to the embodiment of the
invention can be an ink-jet recording apparatus having the ink
supply needle 14 communicating with the ink-jet recording head 4,
wherein the ink supply opening 15 of the ink cartridge 5 is
consequently closely contacted with the ink supply needle 14 via
the packing member 19. Therefore, the packing member 19 needs not
always be provided preliminarily on the ink supply opening 15 of
the ink cartridge 5. That is, an ink-jet recording apparatus
according to the invention can also be obtained such that the ink
cartridge 5 is mounted on the ink supply needle 14 having the
packing member 19 preliminarily provided thereon, or the packing
member 19 is newly added at the time of mounting the ink cartridge
5 on the ink supply needle 14.
As shown in FIG. 4, the ink supply needle 14 to cooperate with the
cartridge has a conical tip end shape, with a plurality of through
holes 36, 36, 36, 36 formed on the tip end surface 34 thereof to
connect the ink in the cartridge to a supply path 35. Accordingly,
the ink in the porous member 21 reaches the ink-jet recording head
4 via the filter 17, the ink supply opening 15, the through holes
36 of the ink supply needle 14, and the supply path 35 so as to be
finally used for printing.
An ink cartridge for an ink-jet recording apparatus according to
the embodiment of the invention is the ink cartridge 5 for an
ink-jet recording apparatus with the above-mentioned configuration,
wherein the packing member 19 is made of a thermoplastic elastomer.
Since the thermoplastic elastomer has a high corrosion resistance
with respect to various kinds of inks, and can be molded by an
ordinary injection molding method, the packing member 19 with a
stable size accuracy can be obtained by molding. As the
thermoplastic elastomer, known materials can be used. Examples of
hard polymer components include a polystyrene component, a
polyethylene component, a polypropylene component, a polyester
component, and a polyamide component. Examples of soft polymer
components include an ethylene propylene rubber component, an
ethylene butadiene rubber component, a polyester component and a
polyether component.
In addition to the hard polymer component and the soft polymer
component, the thermoplastic elastomer contains a polyethylene oil
by 25% or less by weight, more preferably 20 to 25% by weight.
Since a polyethylene oil is contained by 20% by weight or more, a
flowability is given to a thermoplastic elastomer molten fluid so
that the packing member 19 can be molded certainly. Furthermore,
since a polyethylene oil is contained by 25% by weight or less,
even in the case the olefin based amorphous polymer ink supply
needle 14 to be used preferably for a high molding property and a
low gas permeability is inserted in the ink supply opening 15, the
packing member 19 is less likely to degrade the quality of the
olefin based amorphous polymer ink supply needle 14. As the
polyethylene oil, those having the viscosity in the range of 100 to
10,000 CS can be used preferably.
Moreover, the rubber hardness of the thermoplastic elastomer is
preferably 39 to 71 (Shore hardness). Accordingly, the packing
member 19 and the ink supply needle 14 can be contacted closely so
as to maintain the sealing property of the ink channel further
certainly. (If the rubber hardness is more than 71, the role as a
sealing material can hardly be provided. In contrast, if it is less
than 39, an automatic assembly (automatic assembly in a line) is
difficult.) More specifically, the packing member 19 preferably has
a contact tongue piece 19a tiltingly protruded into an interior of
a cylindrical body part 19c so as to contact with the outer
circumferential surface of the ink supply needle as shown in FIG.
5. Since the contact tongue piece 19a has a thick contact part 19b
on the upper end side, and an appropriate length, the contact
tongue piece 19a can easily be deformed elastically when the ink
supply needle 14 is inserted in the arrow direction in FIG. 5. This
ensures, for example, stable contact with the ink supply needle 14
by tolerating size displacement in mounting.
The packing member is not limited to those having a shape shown in
FIG. 5, but can have any shape, such as an O ring-like shape, as
long as the object of the invention can be achieved.
EXAMPLE
The invention will be explained specifically with reference to an
example of the invention, but the invention is not limited
thereto.
Example 1
By molding a thermoplastic elastomer component of the
below-mentioned composition, with an injection molding machine,
into a shape as shown in the cross-sectional perspective view of
FIG. 5, a packing member with a 40 to 70 (Shore hardness) rubber
hardness was obtained.
<Composition of the thermoplastic elastomer>
polypropylene 40% by weight
block copolymer of polystyrene-ethylene propylene
rubber-polystyrene (SEPS) 35% by weight
polyethylene oil (100 to 1,000 CS) 25% by weight
Comparative Example 1
In the same molding process as in the example 1 except that the
thermoplastic elastomer composition was changed to the
below-mentioned composition, a packing member with a 40 to 70
(Shore hardness) rubber hardness was obtained.
<Composition of the thermoplastic elastomer>
polypropylene 15% by weight
block copolymer of polystyrene-ethylene propylene
rubber-polystyrene (SEPS) 35% by weight
polyethylene oil (100 to 1,000 CS) 50% by weight
(Ink cartridge mounting-leaving test)
An olefin based amorphous polymer ink supply needle provided in an
ink-jet recording apparatus (product name of Seiko Epson Corp.:
PM-750C) was fitted into an ink cartridge (product name of Seiko
Epson Corp.: S020093/MJIC7) having a packing member of the
thermoplastic elastomer obtained each in the example 1 and the
comparative example 1 from the ink supply opening of the ink
cartridge so that the ink supply needle and the packing member was
closely contacted with each other. After leaving in this state at
60.degree. C. for three days, the ink cartridge was pulled out from
the olefin based amorphous polymer ink supply needle of the ink-jet
recording apparatus. FIG. 6 is a state diagram of the ink supply
needle before the test, and FIGS. 7 and 8 are state diagrams
respectively showing ink supply needles using the packing members
obtained in the example 1 and the comparative example 1 after the
test. Moreover, the ink cartridge mounting-leaving test was
executed in the same manner with the leaving conditions at
60.degree. C. for three days changed to at 70.degree. C. for three
days. FIG. 9 is a state diagram of the ink supply needle using the
packing member obtained in the comparative example 1 after the
test.
In the case the ink cartridge having the packing member obtained in
the example 1 was used, after the test (leaving conditions:
60.degree. C., three days), the ink cartridge was able to be pulled
out from the ink supply needle easily. Furthermore, as shown in
FIG. 7, the state of the ink supply needle was same as that of FIG.
6 so that quality degradation of the ink supply needle was not
observed. Although it is not illustrated, also in the 70.degree.
C., three day leaving conditions, quality degradation of the ink
supply needle was not observed after the leaving test.
In the case the ink cartridge having the packing member obtained in
the comparative example 1 was used, after the test (leaving
conditions: 60.degree. C., three days), it was difficult to pull
out the ink cartridge from the ink supply needle. As a result of
pulling out the ink cartridge strongly, as shown in FIG. 8, quality
degradation of the ink supply needle was observed. Furthermore, in
the 70.degree. C., three day leaving conditions, as shown in FIG.
9, as a result of pulling out the ink cartridge strongly, the
quality of the ink supply needle was degraded remarkably.
From the results described above, it was confirmed that since the
thermoplastic elastomer contains 25% or less by weight of a
polyethylene oil in an ink cartridge for an ink-jet recording
apparatus according to the embodiment of the invention (example 1),
in the case of inserting an olefin based amorphous polymer ink
supply needle in an ink supply opening, the packing member can
hardly degrade the quality of the olefin based amorphous polymer
ink supply needle.
According to an ink cartridge for an ink-jet recording apparatus
according to the first aspect, since the packing member is made of
a thermoplastic elastomer containing 25% or less by weight of a
polyethylene oil in an ink cartridge for an ink-jet recording
apparatus comprising an ink supply opening having a packing member
capable of closely contacting with the outer circumference of an
ink supply needle provided in an ink-jet recording apparatus main
body, an ink cartridge for an ink-jet recording apparatus
comprising an ink supply opening having a packing member with a
high corrosion resistance with respect to various kinds of inks,
and a stable molding process accuracy can be provided.
Moreover, since the thermoplastic elastomer contains 25% or less by
weight of a polyethylene oil, the packing member can hardly degrade
the quality of the olefin based amorphous polymer ink supply needle
in the case of inserting an olefin based amorphous polymer ink
supply needle in an ink supply opening, and thus an ink cartridge
for an ink-jet recording apparatus comprising an ink supply opening
having a packing member without the risk of causing a malfunction
of the ink-jet recording apparatus can be provided.
According to an ink cartridge for an ink-jet recording apparatus
according to the second aspect, since the rubber hardness of the
thermoplastic elastomer is 40 to 70 (Shore hardness), the packing
member and the ink supply needle can be contacted particularly
closely so that the sealing property of the ink channel can be
maintained further certainly. Therefore, an ink cartridge for an
ink-jet recording apparatus capable of preventing problems such as
drying of the ink by the contact with the outside air, and
introduction of bubbles can be provided.
According to an ink cartridge for an ink-jet recording apparatus
according to the third aspect, since the packing member comprises a
contact tongue piece tiltingly protruded into the interior of the
packing member so as to contact with the outer circumferential
surface of the ink supply needle, owing to the easy elastic
deformation of the contact tongue piece, stable contact with the
ink supply needle can be ensured by tolerating, for example, size
displacement in mounting. Therefore, an ink cartridge for an
ink-jet recording apparatus capable of preventing problems such as
drying of the ink by the contact with the outside air, and
introduction of bubbles can be provided.
According to an ink cartridge for an ink-jet recording apparatus
having an ink supply needle communicating with an ink-jet recording
head according to the fourth aspect, since an ink supply opening of
an ink cartridge for an ink-jet recording apparatus is closely
contacted with the ink supply needle via a packing member, which is
made of a thermoplastic elastomer containing 25% or less by weight
of a polyethylene oil, an ink-jet recording apparatus comprising an
ink supply needle having a packing member with a high corrosion
resistance with respect to various kinds of inks and a stable
molding process accuracy can be provided.
Moreover, since the thermoplastic elastomer contains 25% or less by
weight of a polyethylene oil, the packing member can hardly deform
the olefin based amorphous polymer ink supply needle in the case of
inserting an olefin based amorphous polymer ink supply needle in an
ink supply opening, and thus an ink-jet recording apparatus with an
ink supply opening of an ink cartridge for an ink-jet recording
apparatus closely contacted via a packing member without the risk
of causing a malfunction of the ink-jet recording apparatus can be
provided.
According to an ink-jet recording apparatus according to the fifth
aspect, since the rubber hardness of the thermoplastic elastomer is
40 to 70 (Shore hardness), the packing member and the ink supply
needle can be contacted particularly closely so that the sealing
property of the ink channel can be maintained further certainly.
Therefore, an ink-jet recording apparatus capable of preventing
problems such as drying of the ink by the contact with the outside
air, and introduction of bubbles can be provided.
According to an ink-jet recording apparatus according to a sixth
aspect, since the packing member comprises a contact tongue piece
tiltingly protruded into the interior of the packing member so as
to contact with the outer circumferential surface of the ink supply
needle, the contact tongue piece can easily be deformed elastically
so that stable contact with the ink supply needle can be ensured by
tolerating, for example, size displacement in mounting. Therefore,
an ink-jet recording apparatus capable of preventing problems such
as drying of the ink by the contact with the outside air, and
introduction of bubbles can be provided.
* * * * *